Elastic core for packing material.



A. MONTGOMERY.

ELASTIC GORE FOR PACKING MATERIAL.

APPLICATION FILED JAN. 14.1911.

Patented Apr. 11, 1911.

w 7 amp W UNITED STATES PATENT OFFICE.

ALEXANDER MONTGOMERY, OF NEWTON, MASSACHUSETTS, ASSIGNOR T0 AMERICAN STEAM IACKING COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF '1 MAINE.

ELASTIC CORE FOR PACKING MATERIAL.

Specification of Letters Patent.

Patented Apr. 11,1911.

Application filed January 14, 1911. Serial No. 602,589.

' T 0 all whom it may concern:

Be it known that I, ALEXANDER Monmou- ERY, of Newton. in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Elastic "Cores for Packing Material, of which the following is a specification.

This invention relates to packing material, and its object is to provide an elastic core which will be more resilient than the core hitherto used in packing of this kind.

It p1 y be stated that the particular kind of packing for which this core is especially adapted is intended for use under relatively high pressure. A form of packing adapted for high pressures is illustrated and described in. Letters Patent of the United States 557,855, granted April 7, 1896. In that patent, and in the present application, the core of the packing is composed of elastic material, such as rubber.

A greater degree of elasticity is obtained as the result of this present invention by forming the core of coacting wedge-shaped members, which are arranged in the packing so as to have a wedging action when compressed.

The core in the present case may consist- ,of two or more strips 'of wedge-shaped cross section, the strips being ineased in fibrous material, such as cotton or asbestos, with or without an outer covering of tubular wire fabric.

Of the accompanying drawings which illustrate one form in which the invention may be embodied: Figure 1 represents a perspective view of portions of the core partly assembled. Fig. 2 represents a side elevation of a short section of packing material having a metallic tubular woven covering. Fig. 3 represents a cross section of packing material such as that shown by Fig. 2, inclosing a core composed of strips such as those shown by Fig. 1.

The same reference characters indicate the same parts wherever they occur.

The wedge-shaped strip indicated at 10 is hereinafter termed the central strip. Its broader edge is formed with laterally extending flanges 11, 11, one on either side. A wedge member 12 is arranged to lie, against one wedge face of the strip 10, and a complemental wedge member 13 is arranged to lie against the opposite wedge face of the may be connected with each other at 14, as shown by the drawings, but such connection 1s not essential, although itmay facilitate the manufacture of the core, since the wedge members 12 and 13 may be formed from a single strip; Permanent connection of the wedge members 12 and 13 is desirable because it holds the wedge members in cooperative relation at all times and facilitates assembling a core comprising three wedge members only. The invention, however, is not limited to any number of wedge members, provided there are at least two wedge members. In the form illustrated, the inner faces of the wedge members 12 and 13 are inclined, but the outer faces are parallel. As a modifi'ation. the outer faces of the members 12 and 13 may also be inclined oppositely with relation to the inner faces in case it is desired to include additional wedge members to lie against the outer faces of the members 12 and 13.

\Vhen the wedge members are assembled, the narrow edges of the members 12 and 13 are seated upon the flanges 11, 11, as shown by Fig. 3. When the desired number of wedge members have been assembled in cooperative wedging relation, they are inelosed in a covering of fibrous material 15 which may be either wound around the core or may be woven as a tube or tubes. The

fibrous material is preferably composed of cotton. asbestos, or analogous material, and is preferably impregnated with some suit able lubricant such as graphite, paraifin, or oil. or a compound thereof.-

The tubul p woven wire covering 16 is used to ineloie the packing material when it is to be subjected to great pressure. The form and composition of the fibrous material and of the metallic covering form no part of the present invention and are illustrated and described merely to show the, utility of the core. When the packing is arranged, for example. in a stuffing-box so as to be compressed along its maior diameter, the wedge-shaped members. acting upon each other. cause lateral enioanslon, both by reason of their elastic property and also-byreason of their wedging action. It may be desirableto use a relatively hard compound of rubber for one of the strips and to use relatively soft resilient rubber for the other strip or strips, in which case a greater degree of expansion may be produced by making the central strip 10, in the presentinstance, of the harder material and the outer members 12 and 13 of softer material. The wedging action when the central strip-is composed of harder material and the outer wedge members are composed of softer material would result in relatively great lateral expansion of the outer members and relatively little compressionof the central member.

I claim: A core for packing, comprising a plurality of members composed of resillent material, one of said members being arranged.

between two complemental outer members,

ranged in wedging relation with said inter-- mediate member, the narrower edges of said outer members being arranged to be seated on said flanges.

In testimony whereof I have aflixed my 5 signature, in presence of two witnesses.

ALEXANDER .MONTGOMERY. \Vitnesses lV. P. ABELL, P. V. PEzzE'r'rn 

